string ="他问,你知道cba是什么单词的缩写么?"
print(string)
print('1.删除空格')
print('2.英文标点替换')
print('3.首字母大写')
print('4.退出')
while True:
  option = input("请输入功能选项:\n")
  if option=='1':
    string = string.replace( ' ','')
    print(string)
  elif option =='2':
    for i in string:
      if i == ', ':
        string = string.replace( ', ', '，')
      elif i == '.':
        string = string.replace( '. ', '。')
      elif i == '? ':
        string = string.replace( ' ? ','？ ')
      elif i == '? ':
        string = string.replace("' ","’") 
    string = string
    print(string)
  elif option =='3 ':
    string = string.upper()
    print(string)
  elif option == '4':
    break